Jenkinsfile: print Gradle version (JDK, OS) info during init step.

Author: greenrobot-team

Jenkinsfile

@@ -42,6 +42,7 @@ pipeline {
         stage('init') {
             steps {
                 sh 'chmod +x gradlew'
+                sh './gradlew -version'
 
                 // "|| true" for an OK exit code if no file is found
                 sh 'rm tests/objectbox-java-test/hs_err_pid*.log || true'

ci/Jenkinsfile-Windows

@@ -25,6 +25,8 @@ pipeline {
     stages {
         stage('init') {
             steps {
+                bat 'gradlew -version'
+
                 // "cmd /c" for an OK exit code if no file is found
                 bat 'cmd /c del tests\\objectbox-java-test\\hs_err_pid*.log'
             }